DISEASES OF SHEEP. 67 



may be less fever, but the eyes are very red. This disease 

 in some eases may disappear in two days, and without 

 being at all observed If the inflammation is not too ve- 

 hement, a cure will take place of its own will and without 

 any artificial assistance, the animal appearing perfectly 

 sound until,, after a certain time, many of these animals 

 become afflicted with vertigo. The proper origin of the 

 worm-bladder is as little known as the original formation 

 of the worms found in the abdomen. In one case it was 

 observed that from two hundred lambs which had during 

 the first summer become afflicted with inflammation of the 

 brain, one hundred and sixty were attacked during the fol- 

 lowing winter by vertigo. Another case is reported in 

 which under similar circumstances two hundred out of four 

 hundred sheep died of vertigo. From the above-mentioned 

 and numerous other circumstances, it is evident that vertigo 

 is mostly if not always caused by a former inflammation of 

 the brain, and therefore it is important to investigate the 

 cause of this latter disease. Such cause consists principally 

 in overfeeding the bearing ewes and lambs during winter, 

 by which means a plethoric condition of the animal is pro- 

 duced, which during a hot temperature may lead to inflam- 

 mation of the brain. A large number of lambs are often 

 during summer attacked by inflammation of the brain in 

 consequence of a sudden change from meagre to abundant 

 feeding, especially when the herd is allowed to roam and 

 feed upon stubble-grass after having been kept on close diet. 

 Kuers relates a case in which a herd of four hundred 

 lambs, which had been driven upon an abundant clover 

 stubble-field, were after three days attacked by inflamma- 

 tion of the brain, of which number two hundred died of 

 vertigo during the next winter. Consequently, overfeed- 

 ing or a sudden change of diet and temperature produces 

 the first cause of inflammation of the brain, and subse- 



